Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite

Qianqian Lu; Haisheng Han; Wenjuan Sun; Xingfei Zhang; Weiwei Wang; Bilan Zhang; Wensheng Chen; Qin Zou

doi:10.1007/s12613-023-2697-3

Volume 31 Issue 6

Jun. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(6): 1198-1207

Qianqian Lu, Haisheng Han, Wenjuan Sun, Xingfei Zhang, Weiwei Wang, Bilan Zhang, Wensheng Chen, and Qin Zou, Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1198-1207. https://doi.org/10.1007/s12613-023-2697-3

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Qianqian Lu, Haisheng Han, Wenjuan Sun, Xingfei Zhang, Weiwei Wang, Bilan Zhang, Wensheng Chen, and Qin Zou, Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1198-1207. https://doi.org/10.1007/s12613-023-2697-3

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Research Article

Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite

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Corresponding authors:
Haisheng Han E-mail: hanhai5086@csu.edu.cn

Weiwei Wang E-mail: viviw91@163.com
Received: 24 March 2023; Revised: 25 June 2023; Accepted: 27 June 2023; Available online: 30 June 2023

Abstract

Abstract

Flotation separation of calcite from fluorite is a challenge on low-grade fluorite flotation that limits the recovery and purity of fluorite concentrate. A new acid leaching–flotation process for fluorite is proposed in this work. This innovative process raised the fluorite’s grade to 97.26wt% while producing nanoscale calcium carbonate from its leachate, which contained plenty of calcium ions. On the production of nanoscale calcium carbonate, the impacts of concentration, temperature, and titration rate were examined. By modifying the process conditions and utilizing crystal conditioning agents, calcite-type and amorphous calcium carbonates with corresponding particle sizes of 1.823 and 1.511 μm were produced. The influence of the impurity ions Mn²⁺, Mg²⁺, and Fe³⁺ was demonstrated to reduce the particle size of nanoscale calcium carbonate and make crystal shape easier to manage in the fluorite leach solution system compared with the calcium chloride solution. The combination of the acid leaching–flotation process and the nanoscale calcium carbonate preparation method improved the grade of fluorite while recovering calcite resources, thus presenting a novel idea for the effective and clean usage of low-quality fluorite resources with embedded microfine particles.
- fluorite;
- calcite;
- nanoscale calcium carbonate;
- waste recovery

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